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Paolo Valente 6fa3e8d342 block, bfq: remove all get and put of I/O contexts 
When a bfq queue is set in service and when it is merged, a reference
to the I/O context associated with the queue is taken. This reference
is then released when the queue is deselected from service or
split. More precisely, the release of the reference is postponed to
when the scheduler lock is released, to avoid nesting between the
scheduler and the I/O-context lock. In fact, such nesting would lead
to deadlocks, because of other code paths that take the same locks in
the opposite order. This postponing of I/O-context releases does
complicate code.

This commit addresses these issue by modifying involved operations in
such a way to not need to get the above I/O-context references any
more. Then it also removes any get and release of these references.

Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Jens Axboe <axboe@fb.com>
 		2017-04-19 08:30:26 -06:00
..
partitions partitions/efi: Fix integer overflow in GPT size calculation 2017-01-17 09:02:31 -07:00
Kconfig blk-throttle: add configure option for new .low interface 2017-03-28 08:02:20 -06:00
Kconfig.iosched block, bfq: add full hierarchical scheduling and cgroups support 2017-04-19 08:30:26 -06:00
Makefile block, bfq: introduce the BFQ-v0 I/O scheduler as an extra scheduler 2017-04-19 08:29:02 -06:00
badblocks.c badblocks: badblocks_set/clear update unacked_exist 2016-10-21 15:45:47 -06:00
bfq-iosched.c block, bfq: remove all get and put of I/O contexts 2017-04-19 08:30:26 -06:00
bio-integrity.c block: remove bio_is_rw 2016-10-28 08:45:17 -06:00
bio.c block: trace completion of all bios. 2017-04-07 09:40:52 -06:00
blk-cgroup.c blkcg: allocate struct blkcg_gq outside request queue spinlock 2017-03-29 11:27:19 -06:00
blk-core.c block: trace completion of all bios. 2017-04-07 09:40:52 -06:00
blk-exec.c block: introduce blk_rq_is_passthrough 2017-01-31 14:00:34 -07:00
blk-flush.c block: remove outdated part of blkdev_issue_flush() comment 2017-03-24 15:41:30 -06:00
blk-integrity.c block: constify struct blk_integrity_profile 2017-03-24 20:34:39 -06:00
blk-ioc.c Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2017-03-03 10:53:35 -08:00
blk-lib.c block: remove the discard_zeroes_data flag 2017-04-08 11:25:38 -06:00
blk-map.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
blk-merge.c block: implement splitting of REQ_OP_WRITE_ZEROES bios 2017-04-08 11:25:38 -06:00
blk-mq-cpumap.c blk-mq: export blk_mq_map_queues 2016-11-08 17:30:00 -05:00
blk-mq-debugfs.c blk-mq: Show symbolic names for hctx state and flags 2017-04-10 16:13:33 -06:00
blk-mq-pci.c blk-mq-pci: Fix two spelling mistakes 2017-03-29 11:09:51 -06:00
blk-mq-sched.c blk-mq-sched: provide hooks for initializing hardware queue data 2017-04-07 12:45:41 -06:00
blk-mq-sched.h blk-mq-sched: make completed_request() callback more useful 2017-04-14 14:06:57 -06:00
blk-mq-sysfs.c blk-mq: free hctx->cpumask in release handler of hctx's kobject 2017-03-08 09:56:12 -07:00
blk-mq-tag.c blk-mq: add shallow depth option for blk_mq_get_tag() 2017-04-14 14:06:54 -06:00
blk-mq-tag.h blk-mq-sched: Allocate sched reserved tags as specified in the original queue tagset 2017-03-02 08:56:04 -07:00
blk-mq-virtio.c blk-mq: provide a default queue mapping for virtio device 2017-02-27 20:54:05 +02:00
blk-mq.c blk-mq-sched: make completed_request() callback more useful 2017-04-14 14:06:57 -06:00
blk-mq.h blk-mq: add shallow depth option for blk_mq_get_tag() 2017-04-14 14:06:54 -06:00
blk-settings.c block: remove the discard_zeroes_data flag 2017-04-08 11:25:38 -06:00
blk-softirq.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/topology.h> 2017-03-02 08:42:26 +01:00
blk-stat.c blk-throttle: add a mechanism to estimate IO latency 2017-03-28 08:02:20 -06:00
blk-stat.h blk-throttle: add a mechanism to estimate IO latency 2017-03-28 08:02:20 -06:00
blk-sysfs.c block: remove the discard_zeroes_data flag 2017-04-08 11:25:38 -06:00
blk-tag.c blk-mq-sched: add framework for MQ capable IO schedulers 2017-01-17 10:04:20 -07:00
blk-throttle.c blk-throttle: add latency target support 2017-03-28 08:02:20 -06:00
blk-timeout.c block: remove REQ_NO_TIMEOUT flag 2015-12-22 09:38:34 -07:00
blk-wbt.c block: Fix list corruption of blk stats callback list 2017-04-11 08:09:14 -06:00
blk-wbt.h block: track request size in blk_issue_stat 2017-03-28 08:02:20 -06:00
blk-zoned.c block: Rename blk_queue_zone_size and bdev_zone_size 2017-01-12 07:58:32 -07:00
blk.h blk-throttle: add a mechanism to estimate IO latency 2017-03-28 08:02:20 -06:00
bounce.c Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2015-09-19 18:57:09 -07:00
bsg-lib.c block: split scsi_request out of struct request 2017-01-27 15:08:35 -07:00
bsg.c lib/vsprintf.c: remove %Z support 2017-02-27 18:43:47 -08:00
cfq-iosched.c cfq: Disable writeback throttling by default 2017-04-05 08:15:08 -06:00
cmdline-parser.c block: remove unrelated header files and export symbol 2014-01-21 20:18:26 -08:00
compat_ioctl.c block: remove the discard_zeroes_data flag 2017-04-08 11:25:38 -06:00
deadline-iosched.c block: enumify ELEVATOR_*_MERGE 2017-02-08 13:43:06 -07:00
elevator.c blk-mq-sched: fix crash in switch error path 2017-04-07 08:56:48 -06:00
genhd.c block: Fix oops scsi_disk_get() 2017-03-22 20:11:37 -06:00
ioctl.c block: remove the discard_zeroes_data flag 2017-04-08 11:25:38 -06:00
ioprio.c sched/headers: Prepare to move the task_lock()/unlock() APIs to <linux/sched/task.h> 2017-03-02 08:42:38 +01:00
kyber-iosched.c blk-mq: introduce Kyber multiqueue I/O scheduler 2017-04-14 14:06:58 -06:00
mq-deadline.c block: enumify ELEVATOR_*_MERGE 2017-02-08 13:43:06 -07:00
noop-iosched.c block: move existing elevator ops to union 2017-01-17 10:03:33 -07:00
opal_proto.h block/sed-opal: allocate struct opal_dev dynamically 2017-02-17 12:41:47 -07:00
partition-generic.c block: Rename blk_queue_zone_size and bdev_zone_size 2017-01-12 07:58:32 -07:00
scsi_ioctl.c block, scsi: move the retries field to struct scsi_request 2017-04-05 12:05:08 -06:00
sed-opal.c block: sed-opal: Tone down all the pr_* to debugs 2017-04-07 14:24:16 -06:00
t10-pi.c block: constify struct blk_integrity_profile 2017-03-24 20:34:39 -06:00